Designers gravitate to companies that already suit their own taste obviously. Most of the time they leave a mark of their own not the other way around, so if his work seems SOOO marni it's probably because he was the catalyst for that look much like Margiela's influence was so apparent at Gaultier when he was there.
You can't just wake up and be a different person every 6 months. There is a BIG difference between the expectations of the infotainment sectors like magazines and TV and the boutiques and customers who ACTUALLY BUY THE COLLECTION. Continuity is revered, not revilled as it seems to be on TFS season after season.
One can always apply for the job itself too...